Method for manufacturing polyester fabric for airbag

Abstract

Disclosed is a method for manufacturing a polyester fabric for an airbag that can not only prevent or minimize the separation of a sizing agent, which is provided to a yarn through a sizing process, during a weaving process, but can also maximize a peel strength between a textile substrate and a coating layer to be subsequently formed thereon and lower the stiffness of an airbag fabric by effectively removing the sizing agent from the textile substrate after the weaving process is completed. The method of the present invention comprises: applying a polyester-based sizing agent to a polyester yarn; manufacturing a textile substrate with the sizing agent-applied polyester yarn; removing the sizing agent from the textile substrate under an alkaline condition of pH 8 to 10; and forming a coating layer on the sizing agent-removed textile substrate in order to enhance air-tightness.

The invention claimed is: 
     
       1. A method for manufacturing a polyester fabric for an airbag, the method comprising:
 applying a polyester-based sizing agent to a polyester yarn; 
 manufacturing a textile substrate with the sizing agent-applied polyester yarn; 
 removing the sizing agent from the textile substrate under an alkaline condition of pH 8 to 10 to give a sizing agent-removed textile substrate; and 
 forming a coating layer on the sizing agent-removed textile substrate in order to enhance air-tightness, 
 wherein the removing the sizing agent comprises having the textile substrate pass through a scouring solution of pH 8 to 10; 
 wherein the scouring solution comprises
 water; and 
 an alkaline compound, a permeating agent, an insolubilizing agent, and desizing agent, all of which are dissolved in the water; and 
 
 wherein the amount of the alkaline compound is from about 0.073 wt % to about 0.13 wt % to the total weight of the scouring solution. 
 
     
     
       2. The method of  claim 1 , wherein 100 parts by weight of the alkaline compound, 160 to 190 parts by weight of the permeating agent, 190 to 220 parts by weight of the insolubilizing agent, and 450 to 550 parts by weight of the desizing agent are dissolved in the water. 
     
     
       3. The method of  claim 1 , wherein the removing the sizing agent further comprises having the textile substrate, which has passed through the scouring solution, pass through a washing solution. 
     
     
       4. The method of  claim 3 , wherein the washing solution consists essentially of water. 
     
     
       5. The method of  claim 3 , wherein the scouring solution is contained in first and second scouring baths,
 the washing solution is contained in first, second, and third washing baths, 
 the scouring solution in the first scouring bath is maintained at 50 to 70° C., 
 the scouring solution in the second scouring bath is maintained at 75 to 95° C., 
 the washing solution in the first washing bath is maintained at 70 to 90° C., 
 the washing solution in the second washing bath is maintained at 70 to 90° C., and 
 the washing solution in the third washing bath is maintained at 40 to 60° C. 
 
     
     
       6. The method of  claim 3 , wherein the textile substrate passes through the scouring solution and washing solution at a speed of 10 to 21 m/min. 
     
     
       7. The method of  claim 1 , further comprising, prior to forming the coating layer, the steps of:
 drying the sizing agent-removed textile substrate; and 
 heat-setting the dried textile substrate. 
 
     
     
       8. The method of  claim 7 , wherein the step of heat-setting is carried out at 150 to 190° C.